EASA AD No : 2011-0144

EASA Form 110 Page 1/2 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2011-0144

Date: 26 July 2011

Note: This Airworthiness Directive (AD) is issued b y EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the Europe an Community, its Member States and of the European third countries that participate in the activities of EASA under Article 66 of that Regulation.
This AD is issued in accordance with EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the continuing airworthiness of an aircraft shall be en sured by accomplishing any applicable ADs. Conseque ntly, no person may operate an aircraft to which an AD applies, except in accordance with the requirements of that AD unle ss otherwise specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agre ed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption]. 

### Type Approval Holder’s Name :

EUROCOPTER Type/Model designation(s) : EC 155, SA 365 and AS 365 Helicopters

TCDS Number: DGAC France No. 159

Foreign AD: Not applicable

Supersedure: None



### ATA 05

ATA 64 Time Limits and Maintenance checks – Tail Rotor Hub (TRH) –

Inspection Tail Rotor - Tail Rotor Hub - Inspection / Replacem ent

Manufacturer(s): Eurocopter (formerly Eurocopter France, Aerospatial e)

Applicability: Eurocopter EC 155 B, EC 155 B1, SA 365 N1, AS 365 N 2 and AS 365 N3 helicopters, all serial numbers, if equipped with a rotor hub with Part number (P/N) 365A33351100, P/N 365A33351101 or P/N 365A333 51102 installed on the 10-blade Tail Rotor Hub of the quiet fenestron tail rotor.

Reason: Two cases of cracked 10-blade TRH were recently rep orted to Eurocopter. This condition, if not detected and corrected, coul d lead to a tail rotor jam, possibly resulting in reduced or loss of control of the helicopter. For the reason described above, and pending further investigations, this AD requires repetitive inspections of the 10-blade TRH , and depending of findings, the replacement of the 10-blade TRH.
This AD is considered an interim measure and furthe r AD actions are likely to follow.

Effective Date: 09 August 2011

Required Action(s) and Compliance Time(s): Required as indicated, unless accomplished previous ly: (1) Within 55 flight hours (FH) after the effective date of this AD, accomplish a detailed visual inspection of the 10-blade TRH hu b in accordance with the instructions of Eurocopter EC 155 Alert Service Bulletin (ASB)EASA AD No : 2011-0144

EASA Form 110 Page 2/2 05A021 Revision 1, or Eurocopter AS 365 ASB 05.00.6 0 Revision 1, as applicable to the helicopter version. An inspection performed before the effective date of this AD in accordance with Eurocopter EC 155 ASB 05A021 or Eur ocopter AS 365 ASB 05.00.60 at original issue is acceptable to comply with the requirements of this paragraph. (2) Thereafter, at intervals not to exceed 55 FH, r epeat the inspection of the 10-blade TRH, in accordance with the instructions o f Eurocopter EC 155 ASB 05A021 Revision 1 or Eurocopter AS 365 ASB 05.0 0.60 Revision 1, as applicable to the helicopter version. (3) If, during an inspection as required by paragra ph (1) or (2) of this AD, any crack is found in the TRH, before next flight, replace the TRH with a serviceable part, in accordance with the instructio ns of Eurocopter EC 155 ASB 05A021 Revision 1 or Eurocopter AS 365 A SB 05.00.60 Revision 1, as applicable to the helicopter version

. A TRH replacement accomplished before the effective date of this AD in accordance with Eurocopter EC 155 ASB 05A021 or Eur ocopter AS 365 ASB 05.00.60 at original issue is acceptable to comply with the requirements of this paragraph. (4) Replacement of a TRH hub as required by paragra ph (3) of this AD does not constitute terminating action for the repetitive i nspection requirements of paragraph (2) of this AD.

Ref. Publications: Eurocopter EC 155 ASB 05A021 Revision 1 dated 20 Ju ly 2011; Eurocopter AS 365 ASB 05.00.60 Revision 1 dated 20 July 2011. The use of later approved revisions of these docume nts is acceptable for compliance with the requirements of this AD.

Remarks : 1. If requested and appropriately substantiated, EA SA can approve Alternative Methods of Compliance for this AD. 2. The required actions and the risk allowance have granted the issuance of a Final AD with Request for Comments, postponing th e public consultation process after publication. 3. Enquiries regarding this AD should be referred t o the Safety Information Section, Executive Directorate, EASA. E-mail ADs@easa.europa.eu

. 4. For any question concerning the technical conten t of the requirements in this AD, please contact: EUROCOPTER (STDI) - Aéropo rt de Marseille Provence 13725 Marignane Cedex, France. Telephone +33 (0) 4 42 85 97 97, Fax +33 (0) 4 42 8 5 99 66. E-mail: Directive.technical-support@eurocopter.com

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